Search Publications
Spectral Components in the Optical Emission of the Seyfert Galaxy NGC 5548 and the Comparison of Intrinsic Nuclear Spectra with Accreting Corona Model
Czerny, B.; Kuraszkiewicz, J.; Loska, Z.
We study the extensively monitored Seyfert galaxy NGC 5548 and compare its nuclear emission with models of accretion disk with accreting corona. To obtain the intrinsic nuclear spectra from the observed spectra we had to estimate and subtract the contribution from circumnuclear components such as stars, the Balmer continuum and blended FeII lines,…
Ultraviolet DIB at 1369 A Arising in Molecular Clouds
Gnacinski, P.; Sikorski, J.; Kaczmarczyk, G.
Hubble Space Telescope (HST) and IUE observations of the weak unidentified interstellar line 1369 A in nine early type stars are discussed. This absorption feature might be a diffuse interstellar band (DIB). We have found good correlation between the equivalent widths of the 1369 A line and the interstellar CO A1Pi-X1Sigma (6…
Ultraviolet Ionization Stratification in Wolf-Rayet Winds
Rochowicz, Krzysztof
Ionization stratification can be used to study the structure of WR winds. In an accelerated outflow the stratification is observable through the Doppler effect as an inverse correlation of ionization potential (IP) with line width (FWHM). However, not only the average line widths of different ions, but also the line widths of one series of HeII sh…